Update MVC functional test

Author: SteveSandersonMS

src/Mvc/test/WebSites/BasicWebSite/RazorComponents/RouterContainer.razor

@@ -1,6 +1,7 @@
 @using Microsoft.AspNetCore.Components.Routing
 Router component
 <Router AppAssembly="System.Reflection.Assembly.GetAssembly(typeof(RouterContainer))">
+    <Found Context="routeData"><RouteView RouteData="@routeData" /></Found>
     <NotFound>
         <p>Route not found</p>
     </NotFound>